D9403: Fix dropping of emails onto favorites

[David Faure]

dfaure created this revision.
dfaure added reviewers: dvratil, mlaurent, mkoller.
Restricted Application added a project: KDE PIM.

REVISION SUMMARY
  and dropping a collection to define a new favorite.
  
  BUG: 387873

TEST PLAN
  Tested all three features, reordering, adding, and dropping a mail.
  
  Two issues left:
  
  - adding a new favourite at a specific position (patch pending for akonadi's favoritecollectionsmodel)
  - the "+" when moving to reorder shouldn't appear, should be MoveAction only, don't know if that's possible here though.

REPOSITORY
  R92 PIM: Common Mail Support

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9403

AFFECTED FILES
  src/folder/favoritecollectionorderproxymodel.cpp
  src/folder/favoritecollectionorderproxymodel.h
  src/widgets/favoritecollectionwidget.cpp
  src/widgets/favoritecollectionwidget.h

To: dfaure, dvratil, mlaurent, mkoller
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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